Question

Annelids, like the earthworm, and arthropods, like insects or spiders, have three main structures in their nervous systems: _____.
A. a brain, a dorsal nerve cord, and a ventral nerve cord.
B. a brain, segmented ganglia, and a ventral nerve cord.
C. segmented ganglia, a dorsal nerve cord, and a ventral nerve cord.

Answer 1

brain,segmented ganglia and ventral nerve cord

Answer 2

The correct answer is B. a brain, segmented ganglia, and a ventral nerve cord. 

Annelids, like the earthworm, and arthropods, like insects or spiders, have three main structures in their nervous systems namely a primitive brain, ganglionic mass, connected by a ring of nerves to a ventral nerve cord.